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High-Power Switching Regulators Parametric Search
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Application Notes
AN-556: Introduction to Power Supplies

Switching Voltage Regulator Fundamentals: Commonly used switching converter types

Power Designer 114: Best Layout Practices for Switching Supplies

Power Designer 120: Calculating Losses and Junction Temperature for High-Power-Density Switching Converters

Useful Links
national.com/easy
Easy-to-use tools and resources to support your next design

national.com/powerwise
Energy-efficient products with excellent performance-to-power ratios

Designing with high-frequency switching regulators is optimal for applications with space and height restrictions. However for all of their benefits, high switching frequencies increase typical power supply challenges of power dissipation, electromagnetic interference (EMI), and limitations on the useful maximum input voltage.

Thanks to new process technology optimized for high switching frequency as well as improved figure-of-merit MOSFETs, National has developed a family of high-efficiency buck regulators with up to 6 MHz switching frequency. These devices offer increased performance over wider input voltages with faster transient response and the ability to maintain output voltage ripple with smaller components. Internally compensated, these easy-to-use buck regulators are industry leaders in power density.

View our latest webinar on power supply design made easy for space-constrained applications.

Dual 2A Synchronous Buck Regulator with Internal Compensation
The LM26420 delivers two outputs at up to 2A and is ideal for powering core and I/O voltages in FPGA, CPLD, and ASICs.

42V 300 mA/600 mA Buck Regulator in Thin SOT-23 Packaging
The LM2841 / LM2842 support 24V rails and are available in a thin SOT-23 package.

1.5 MHz/3 MHz 3.0A Step-Down DC-DC Switching Regulator
The LM2833 non-synchronous buck regulator is ideal for 5V and 3.3V rails and available in a tiny
LLP-10 or MSOP-10 package.

2A, Wide Input Range Buck Regulator with Frequency Synchronization
The LM27342 is synchronizable to an external 1 MHz to 2.35 MHz external clock and reduces electromagnetic interference (EMI) by avoiding unwanted frequency bands.

1.5A Step-Down DC-DC Switching Regulator
The LM2738 non-synchronous 3V to 20V buck regulator is ideal for 12V conversions and features a
250mΩ switch for low RDSON improved efficiency.

6 MHz Buck Regulator
The LM8801 is capable of driving up to 600 mA of output current, provides a tiny footprint, and is ideal for point-of-load conversion in space-constrained and portable applications.

LM20xxx Up to 6A Full-featured PowerWise® Synchronous Buck Regulators

LM3491x Ultra-High-Density 50 Vin, 1.25A ~2 MHz Step-Down Converters in LLP® and micro SMD Packaging

LM3691 PowerWise High-Accuracy, Miniature 1A, Step-Down DC-DC Converter in micro SMD Packaging

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